Type-writer.



G w. DAVIS. TYPE WRITER.

APPLICATION FILED JAN. 3, 1907.

1,025, 1 29. Patented May 7, 1912.

7? 41 j 2 v v 3 mama-sum z.

G. W. DAVIS.

TYPE WRITER.

APPLICATION FILED mum, 19'07.

1,025,129. 'Patentd May 7, 1912.

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE: v

' TYPE-WRITER.

1,025,129. Specification of Letters Patent v Patented May 7, 1912.

Applicatioiilfiled January 3, 1907. Serial in. 650,637. I

. bar 2 extending transversely beneath levers f 1 of the space '.bar 9' to be presently described. The device for yieldingly retaining the dog rocker in its normal position (Figs. 1, 4, and consists of anarm 4 extending forwardly and diagonally upward from the middle thereof and of T-form with a retractile' cylindrical spring" 5 con-1 necting one end of'ts crosspiece to the top v of one arm 6 of a bell-crank lever, the other arm whereof has-a horizontal lug 7 '(Figs.

. l, 4, 5 and 6) perforated and tapped to receive the upper end of an adjusting screw 8, carried rotatably in. a perforation 9 in a lug 10 formed rigidly upon themain frame of the machine. This screw has a transverse pin 12 extending therethroughbe neath a portion 13 of the main frame which is formedwith agroove in which this in is adapted to lie when in its normalposition and by which it is prevented from accidental displacement and the screw from accidental rotation, although the edges of this'groove are slightly rounded toallow of thescrew To all whomz't may concern:

Be it known that I, GEORGE WiLLlAM DAVIS, of lVestmount, in the district of Montreal, Province of Quebec, Canada, 5 have invented certain new and useful Improvements in Type-Writers; and I do hereby declare that the following is a full, clear, and exact description of the same.

This invention relates particularly to 10 type-bar machines and it has 'for its object to provide in machines of this class, improved carriage feed mechanism.

The invention may be said briefly to consist of means for returning the loose escape- 15 ment dog to its proper working position after displacement to either side, means for protecting the escapement mechanism from dust and damage, means for varying the resistance to the action of the machine, novel 20/ escapement mechanism, and space bar mechanism. For full comprehension, however, of my invention reference must be had to the accompanying drawings, forming a part of this specification, in which similar 2-5 reference characters indicate the same parts, and wherein Figure l is a longitudinal sectional view of the frame of a sliding type bar typewriting machine with the parts to which 33 the present invention relates applied thereto; Figs. 2 and 3 are detail perspective and plan views of portions of the space bar mechanism; Fig. 4 is a side elevation illuse trating the means for varying the resist 3-5 ance to theaction of the machine and the escapcment mechanism; Fig. 5 is a plan move the operating end of the loose dog to, view of the devices shown in Fig. 4; Fig. 6 and retain it in a position to engage the apis an enlarged detail side elevation partly in preaching tooth of the escapementor 1 section of one of the parts of the means for sprocket wheel '17. Normally the sprocket 4O varying the resistance to the action of the wheel retains this loose dog (against the 9 machine; Fig. 7 is a perspective view of the resistance of the spring '16) in-j'uxtapo'sition pawls of the escapement mechanism; Fig. 8 with a fixed dog 18. Both dogs are mount is a side elevation of the lower portion of ed in a rearwardly extending arm 20=on the*[ the carriage with the escapement mechadog rocker 2 and *are preferably located in I while by turning this screw the bell-cranklever is turned on its pivot point, and the spring 5 for retaining the dog rocker in its normal position is adjusted and the resistvaried. The other end of the cross bar ofthe T-arm 4 is extended to a p'oint in linewith the loose escapement dog 15 to which it is yieldingly connected by a retractile cy-" lindrical spring 16. This spring tends to being rotated for purposes of adjustment, 8.0

ance to touch or to the action of themachine 85 25 nism; and Figs. 9 and 10 are side elevation separatehorizontal recesses 21 and 22 to and plan view of a part of the esoapement facilitate-fitting the-fixed dog 18 being rigmechanism. v idly secured in the lower recess 21 by ,a The frame of the machine is indicated at screw 23, while the loose dog 15 is pivotally 1) ant. the carriage ate, cZ being the usual secured in the upper recess by a pin 24 5-3 type guide plate. Figs. 5 and 7 and an adjusting screw'25 1 The -escapement mechanism (Figs. 1, 4, locked by a nut 26 enables the normal posi- 5, 7, 8, 9 and 10) comprises a dog rocker tion of this loose dogftobe adjusted rela y bar 2, having a pair of forwmlly projecttively to the fixed dog. I ing'arms 3 one located near each end there-' The escapement or sprocket wheel 17 is" of and pivotally connected to a universal rotatably mounted ina bracket-3O (Figs; 1, 13.0

4, 5, and 8) secured by screws 31 tothe main frame of the machineaiid beneath the usual type guide plate (I (Fig. 1) while a pinion 322 is preferably made integral with the shaft upon which this sprocket .wheel 17 is mounted and in position to be engaged by the escapement rack to be presently further alluded to. The advantage of this arrangement of the escapement mechanism and the members thereof relatively to one another is that the loose dog will be returned to its proper working position after displacement to either side (it is displaced by sprocket 'wheel 17 when the carriage is beingfed or returned) and the entire escapement mechanism is protected from dust and damage. i

The escapement release mechanism (Figs.

' 1, 4, '5, 8,9, 10) consists of a particular man ner' o t-mounting the rack and a depressible key and intermediate devices therebetween for displacing'or shifting the rack. The

' novel feature of this mechanism is a member of the intermediate mechanism, but for full comprehension of its application it is neces-' sary to describe "the entire combination. This escapement release mechanism com prises in connection withthe rack 40 (before mentioned) ,a. pair of bell-cranlelevers 41 (shown in detail in Figs -9 and 10)" one arm ofgeach of whit-his secured rigidly to the opposite end'of the rack, such levers being pivoted, as at 42, to the end franie pieces of the maincarriage c, the other arms of these bell-crank-levers being connected by springs 43 to the carriage and normally held thereby yieldingly in contact with i top edge of one of the carriage rails 44, this rack supporting means also carries a rail 45 forming a portion of the brake mechanism to be hereinafter mentioned. This arrange ment maintains the rack yieldingly -1Ii en;

1 gagenient with the pinion 32.

Y an

I In order to enable the rack to be released from the pinion the bell-cranlr-lever 41 at the'left end of the carriage (looking from the key-board towardthe platen)" has an extension 46 to which one end of a bent arm 47 is ivoted, at 48, the portionv of such arm a jacentto its opposite end being longitudinally slotted. as at 49 eccentrically to the pivot point 48 and acting upon a screw 5Q.carried by. the carriage end; while an upwardly extending I'0d 51 is pivoted at its lower end to the said slotted end of the bent leverand is guided in a perforated capping plate 52 secured uponthetop of the 'carriage,.the topofth'e rod being provided with a button 53. By depressing this button the bent-arm 47 is rocked and the-e01 centrioslot therein (which constitutes a cam), acting upon the screw 50 draws its pivoted end and-consequently the rack away. from the pinior, thus releasing the escape ment and all'owingthe carriage to be moved freely in either direction. This arm 47,

ends bent to form arms m.

with its cam slot 49, is the member constititing the main novel feature of this escapement released mechanism.

The space bar 9 and its connection to the universal bar is in the main, of the usual construction. The levers f for supporting this space bar extend to the rear of the machine and are fulcruined usual upon the same bar, 71., as the key levers i (Fig. 5). This disposition of the space bar levers tends to make the spacebar unsteady in that the depression of one end will cause the bar to tilt and not affect the opposite end. This defect is overcome by means of a rocking bar j rotatably mounted in bearings 70 upon the front of the main frame,and having its These arms are longitudinally slotted as at n and fit slidably upon pins 0 carried by the levers f,

nected at one end to one of the arms at its oppositeend to one of the bearings h (Fig.

A two armed stop 1' (Figs. 1 and 2) is I mounted rigidly upon the bar j'and limits the movement thereof .in both directions by hearing, at different times, upon the machine frame and the keyboard cover-plate the universal bar t in its normal position. The carriage construction and roller'bearings therefor and the shift mechanism are not hereinclaimed as they form the subject indicated at s (Fig. 1). This stop also-stalls matter of separate applications filed June 23, 1911, under Serial-No. 634,952 and June 23. 1911. under Serial No. 634,953. v

Having thus described and ascertained the nature of the said invention and in what manner the same is performed, it is hereby declared that what is. claimed is as follows:-

1. In a typewriter of the sliding type bar class, the combination with the escapement wheel, a dog rocker having the rearwardly projecting loose escapement dog pivoted thereon in engaging relation with the wheel,

of a forwardly projecting arm upon such dog'rocker and having a cross piece the end of which is in line with the dog, and a coiled rctractile spring '-extending on the same vertical plane as the dog and connected atone end to the dog and at its other to theend of the said cross-arm.

2.111s typewriting machine, the combination with a carriage and means tending to move the same toward one end of the machine, of escapement mechanism oompris ing a dog rocker, a forwardly and diagonally upwardly extending arm upon the dog rocker, a bell-crank-lever, a rctractile spring connecting the said arm to one arm of the b'ell crank-lever, an adjusting screw ,carried b eg n th thee machine, of escapementimeclia ing adogrocker, I nally upwardly extendiiig arm upon the dog rocker, a bellcrank-lever, a retractile spring connecting the said arm to one arm of the bell-crank-lever, an adjusting screw carried by the frame of the machine and enin compris- I -gaging the other arm of such bell-cranklever for the purpose of enablingvthe resistance to the action of the machine to be varied, and a pin carried by the screw and engaging a groove in the frame of the machine for preventing accidental rotation of the screw,

4. In a typewriting machine, the combination wit-ha carriage and means for tendi the bell-crank-lever, an adjusting screw caring to move the same toward one end of the machine, of escapement mechanism comprising a dog rocker, a forwardly and diagonally upwardly extending arm of T- form upon the dog rocker, a bell-crank-lever, a retractile spring connecting one end of the cross-piece of the said arm to one; arm of ried by the frame of the machine and engaging the other arm of such bell-cranklever for the purpose of enabling the resistance to the action of the machine to be varied, loose and fixed escapement dogs carried by the dog rocker, asprocket wheel carried by the frame of the machine,'a rack carried by the carriage, a retractile spring connected -to the other end of the said cross bar and to the loose escapement dog retaining the latter with its end away from the end of the fixed dog,"and the sprocket wheel,

normally retaining the said end of the loose dog in juxtaposition with the fixed dog.

5. In a'typewriter, a dog rocker, an arm projecting rearwardly from such rocker and having a pair of separate horizontal recesses, a dog fixedly secured in one of the said recesses, a dog pivotally mounted in-thc other recess, and an adjusting screw with a lock nut for determining the position of the said pivoted pawl relatively to the fixed pawl.

6. In a typewriting machine of the sliding type-bar class, the combination of the frame of the machine rotatably supporting a horizontal pinion, a carriage, a pair of bell-crank-levers fulcrumed at their angles to the ends of the carriage, a toothed rack carried by the rear arms of such levers and having its teeth arranged vertically, springs connected between the other arms of the levers and the carriage, a bent arm ful- "wary. igand dia he tranaetth e ehineaneem L typew g lass space; ban}, supportedihy 5 the"; end

' hQiCOfibillfllilOllfiWilfhiitlle fins; idistin'et 1 @from: ithe connection, betweenrisuehlzsliacex bar aneliits levers for causing both ends thereof to move in' unison upon the depression of one end.

8. In a typewriting machine of the class utilizing a space-bar supported by the ends of a pair of levers, the combination with the said space-bar, of a rocking bar rotatably mounted upon the frame of the machine and pivotally connected at its opposite ends to the levers, and means normally yieldingly retaining the space-bar in its elevated position.

- 9. ,In a typewriting machine of the class utilizing aspace-bar supported by the ends of a pair of levers, the combination with the said space-bar, of a rocking bar rotatably mounted upon the frame of the machine and having its ends provided with arms pivotally connected to the levers, and means normally yieldingly retaining the space-bar in its elevated 'position.

10. In a typewriting machine of the class utilizing a space-bar supported by the ends of a" pairof levers, the combination with the said space-bar, of a rocking bar rotatably mounted upon the frame of the machine and having its ends provided with l0ngi-- tudinally slot-ted arms and the levers having pins engaging the slots in the said arms, and means normally yieldingly retaining the space-bar in its elevated position.

11. In a typewriting machine, the combination with a space bar, of-a member movably mounted on the machine and provided with a device coacting with a stationary partof the machine to limit the movement of said member in both directions, and means operatively connecting the said memher to the space bar, for the purpose set forth.

12. In a typewriting machine of the class utilizing a space-bar supported by the ends .of a pair of levers, the combination with the said space-bar, a rocking bar rotatably mounted upon the frame of the machine and pivotally connected at its opposite ends to the levers, means normally yieldingly retaining the space-bar in its elevated position, and a two armed stop mounted rigidly upon the said rocking bar and coacting with the frame of the machine for limiting the movement of the space-bar in both directions.

13. In a typewriting machine of the class utilizing a space-bar supported by the ends of a pair of levers, the combination with the said space-bar, a rocking bar rotataoiy metal bent to receive the rocking bar and mounted upon the frame otthe machine presenting padded ends projecting toward andipivotally connected at its opposite ends the front of the machine and the cover-plate. to the levers, means norn'ially yieldingly rei In testimony whereof, I have signed my 5 'taining the spacebar in its elevated posiname to this specification, in the presence 15 tion, and a two armed stop mounted rigidly of two subscribing Witnesses.

upon the said rocking bar and coacting with GEORGE VILLIAM DAVIS. the frame of the machine for limiting the \Vitnesses: movement of the space-bar in both direc- WILLIAM P. MCFEAT,

10 tions, the said stop consisting of a strip of F RED J. SEARS. 

